fix($location): don't clobber path during parsing of path

Closes angular#7199

src/ng/location.js

@@ -200,7 +200,7 @@ function LocationHashbangUrl(appBase, hashPrefix) {
       Matches paths for file protocol on windows,
       such as /C:/foo/bar, and captures only /foo/bar.
       */
-      var windowsFilePathExp = /^\/?.*?:(\/.*)/;
+      var windowsFilePathExp = /^\/[A-Z]:(\/.*)/;
 
       var firstPathSegmentMatch;
 
@@ -209,10 +209,7 @@ function LocationHashbangUrl(appBase, hashPrefix) {
         url = url.replace(base, '');
       }
 
-      /*
-       * The input URL intentionally contains a
-       * first path segment that ends with a colon.
-       */
+      // The input URL intentionally contains a first path segment that ends with a colon.
       if (windowsFilePathExp.exec(url)) {
         return path;
       }

test/ng/locationSpec.js

@@ -1539,6 +1539,16 @@ describe('$location', function() {
       expect(location.url()).toBe('/not-starting-with-slash');
       expect(location.absUrl()).toBe('http://server/pre/index.html#/not-starting-with-slash');
     });
+
+
+    it('should not strip stuff from path just because it looks like Windows drive when its not',
+        function() {
+      location = new LocationHashbangUrl('http://server/pre/index.html', '#');
+
+      location.$$parse('http://server/pre/index.html#http%3A%2F%2Fexample.com%2F');
+      expect(location.url()).toBe('/http://example.com/');
+      expect(location.absUrl()).toBe('http://server/pre/index.html#/http://example.com/');
+    });
   });